Flamelet model stationary

Generally, near the stoichiometric surface, both terms in (5.268) are large in magnitude and opposite in sign (Peters 2000). A quasi-stationary state is thus quickly established wherein the accumulation term on the left-hand side is negligible. The stationary laminar flamelet (SLF) model is found by simply neglecting the accumulation term, and ignoring the time dependency of x( , t) ... 

Models conditioned on the turbulent dissipation rate attempt to describe non-stationary effects due to the fluctuating strain-rate field, and thus should be adequate for flamelet applications which require a model for the mixture-fraction dissipation rate at the stoichiometric surface. 

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